2018 South Dakota elections
Incumbent Republican U.S. Representative Kristi Noem did not run for re-election and instead ran for governor.
Incumbent Republican governor Dennis Daugaard was term-limited and could not seek a third consecutive term.
Incumbent Republican Secretary of State Shantel Krebs did not run for re-election and instead unsuccessfully ran for Congress.
Incumbent Republican State Treasurer Rich Sattgast was term-limited and could not run for a third term.
Josh Haeder, Northeast Director for Senator Mike Rounds, ran for the Republican nomination and won.
Barnett
- 50–60% 60–70% 70–80% 80-90% >90%
Frederick
- 50–60% 60–70% 70–80% >90%
Haeder
- 50–60% 60–70% 70–80% 80-90%
Matson
- 50–60% 60–70% 70–80% >90%
Sattgast
- 50–60% 60–70% 70–80% 80-90%
Cool
- 50–60% 60–70% 70–80% >90%
Brunner
- 50–60% 60–70% 70–80% 80-90% >90%
Houser
- 50–60% 60–70% 70–80% >90%
Fiegen
- 50–60% 60–70% 70–80% 80-90%
Frederick
- 50–60% 60–70% 70–80% 80-90% >90%